Answer:
The phenomenon of water leakage caused by poor installation of window frames is the top priority for the after-sales service departments of major construction companies in China. Their repair frequency is high. The repair methods for water leakage mainly include the following:
(1) Renovating techniques—This involves completely removing the existing mortise around the window frame from inside, then resealing the gaps with water-resistant cement without shrinkage, followed by applying waterproof coating to the surface.
(ii) The coating method—that is, when exterior wall construction is carried out, after the window frame edges are filled with sealant and repaired, the tile surface is coated with a 30–50 cm wide non-film water-repellent agent or other resin-based waterproof paint.
(3) Infusion techniques—can be divided into three types of construction methods:
(1) For the open-mouth eight-way crack, epoxy resin (EPOXY) low-pressure injection reinforcement is used; water cannot be injected.
(2) The sealing low-pressure injection uses hydrophilic PU foam expansion agent. However, the material used must be a PU material specifically designed for internal injection of the wall structure.
(3) Using ultra-fine cement for low-pressure injection reinforcement. This method improves the capillary phenomenon within the embedded joints caused by poor construction by utilizing the material’s special properties such as high flowability, high adhesion strength, and high compressive strength (8500 PSI or more). According to my years of experience, this method is the most successful in repairing defects caused by poor construction, but it also takes the most time and effort. Therefore, many companies use the injection method, with a success rate of about 6–7%. It is fast and does not cause any indoor pollution, while the painting method has no effect at all.